Thnx so much for the updates and hard work for the great painttool but I see only a gray screen if I activate the new Vector (V) Tool, looks like painting blind. Because if I hit V key again, I see some painting strokes. Should I maybe update my GPU driver?

No, Zero, everything is fine on your machine! It shows the fluid dynamic vectors (motion vectors), in real time! If nothing moves, it will look gray. Turn up Fluidity to 100% and have fun! This is an expert feature, though, for people, who know what it's really for. You can use it (a motion vector image), for example, in compositing or on textures, to suggest or even create motion within the texture. Common use would be for water, for example. There are some free tools online to preview such motion vector textures.Others may use it as an art tool just by itself, because it has certain special qualities. I yet have to allow to project it back into a color layer, but this all is stuff I will still do later on. For now it is mostly expert only. But, rest assured, your computer is in perfect order, if it mostly looks gray. This "gray", by the way, is a value of 0.5 in all color channels (R, G, B). A texture shader that uses motion vector images will do a little math on it to bring this to 0.0 so that RGB values can go from -1.0 to 1.0, representing full motion vectors. Ordinary image formats do not support negative values, you know.A shader, for example, would have a line that goes:vec3 outMotion = 2.0*(inColor-0.5);

Yeah, thought about it (in fact, having worked on it until a few minutes ago), but it is not trivial at all and can't quite do what one might imagine. Thing is, those flows have different speeds, of course, which will stretch the coordinates farther and farther apart rather than creating a kind of "river like" flow, so to say. I could do a sort of normailzation or equalization, which might create a more continuously legible flow of sorts, but even that is a tall order. The primitive offset of UV coordinates by the motion vectors on the pixel they sit on can create a neat effect, if I do some trickery with cross fading original and transformed image, but it looks cheap to my eyes. I'm contemplating possible options, but also don't want to waste too much time on it, because it is truly just a gimmick!